Malicious PDF — malware analysis report

Static analysis result for SHA-256 66da3218473617e2…

MALICIOUS

PDF

107.5 KB Created: 2021-03-10 07:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bd13fbc1a333486e6ad3e1c6c6abe0cc SHA-1: 28411f38ccd869497fd073fd04c83bd71f55232d SHA-256: 66da3218473617e2b7188cc7bd4ed5d62c717de41eb8fec1efdb32c622824943
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/123?utm_term=scatter+plots+and+correlation+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/fuvebopeweb/QoYhcUf/camerafi_live_download_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_603a62bcb8bd5.pdfIn PDF document text
    • https://vafobuzegigotot.weebly.com/uploads/1/3/0/7/130775214/5097087.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/441292.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/cxhcnmu/star_wars_clone_wars_chronological_order.pdfIn PDF document text
    • https://vovinusowoxojik.weebly.com/uploads/1/3/4/3/134349833/4334130.pdfIn PDF document text
    • https://kepudeveru.weebly.com/uploads/1/3/4/6/134698703/f959f6a5bd098.pdfIn PDF document text
    • https://ruragivelexodi.weebly.com/uploads/1/3/4/6/134663557/xamefusuvaramumuzuf.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/xebijononoxek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5ffea435000dd.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/hjAfjhc/zizadosox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482882/normal_5fc5bebbbc82d.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/86995157513.pdfIn PDF document text
    • https://mevimozow.weebly.com/uploads/1/3/0/7/130776561/0a0721.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/02c9ea162.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/66692b.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/minefoxegik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9135c8-bc0e-419d-bc07-e4caba664181/how_to_bleed_craftsman_2_ton_floor_jack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5506d07e-e5fd-452f-af6f-2e7ca61e69ba/8_limbs_of_ashtanga_yoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa3e1db-c50d-4be8-b281-258eb7c777ab/2020_drz400s_maintenance_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4c3232-98bc-4b4f-8239-ec2e34e03d8f/que_se_necesita_para_hacer_un_doctorado_en_psicologia.pdfIn PDF document text
    • http://sopexalibip.onlinewebshop.net/menace_d_accouchement_prmatur.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 2988 bytes
SHA-256: 4119c2e8f0f70e3b2c620c848ce8563f32f0880b64b44cf5bf34c70fb95c6cda
font_01_sfnt_off00013533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13533 5520 bytes
SHA-256: 1d6cefacd9f4ed415327d6a3c2694909f51751f34f23469a7e0326079461eb0d
font_02_sfnt_off0001480a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480A 14708 bytes
SHA-256: ee3051244ad210de3afc21808a5f84b734004ebfb4bb60c6d49a0c60f1227c0c
font_03_sfnt_off000177c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177C1 17012 bytes
SHA-256: 60c9d68e5d4cfab0fb968b76696d6924a56810b605175aa5b171878380663f9e
font_04_sfnt_off00019044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19044 6068 bytes
SHA-256: 5f70c3a78c466de81a09c3c380e83bc74c22a6e1847125ce9255010b2d7c6a6d

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